Which construction method uses falsework to support poured concrete on site and can burn away, creating a collapse hazard?

Which construction method uses falsework to support poured concrete on site and can burn away, creating a collapse hazard?

• A. Cast in Place
• B. Pre-Cast
• C. Spalling
• D. Metal Deck Roof Fire

Answer: (A)

Cast in place involves pouring concrete into forms and using falsework on the construction site to support the wet concrete while it cures. In a fire, the falsework—often made of wood or other combustible materials—can burn away before the concrete gains sufficient strength, leading to a collapse hazard. This on-site, temporary support aspect is the key reason this method poses a fire-related collapse risk. Pre-cast, by contrast, uses components manufactured off-site and installed later, reducing reliance on on-site falsework during fire exposure. Spalling is a concrete damage mechanism from heat, not a placement method, and a metal deck roof fire describes a different scenario entirely.

Cast in place involves pouring concrete into forms and using falsework on the construction site to support the wet concrete while it cures. In a fire, the falsework—often made of wood or other combustible materials—can burn away before the concrete gains sufficient strength, leading to a collapse hazard. This on-site, temporary support aspect is the key reason this method poses a fire-related collapse risk. Pre-cast, by contrast, uses components manufactured off-site and installed later, reducing reliance on on-site falsework during fire exposure. Spalling is a concrete damage mechanism from heat, not a placement method, and a metal deck roof fire describes a different scenario entirely.